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<!DOCTYPE html> <html> <body> <p>y = 5, calculate x = --y, and display y and x:</p> <button onclick="myFunction()">Try it</button> <p><strong>Note:</strong> Both variables, y and x, are affected.</p> <p id="demo1"></p> <p id="demo2"></p> <script> function myFunction() { var y = 5; var x = --y; document.getElementById("demo1").innerHTML = y; document.getElementById("demo2").innerHTML = x; } </script> </body> </html>